Oromiffa was spoken as a first language by 78.99%, 8.3% spoke Hadiya, 4.89% spoke Alaba, 2.74% spoke Kambaata, and 2.35% spoke Amharic; the remaining 2.73% spoke all other primary languages reported.
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There was a report that rapid deployment forces of the federal and regional police killed two members of the Southern Ethiopia Peoples' Democratic Coalition (SEPDC) during a January 2000 meeting organized by the Council of Alternative Forces for Peace and Democracy in Ethiopia in Seraro.
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The five largest ethnic groups reported in Seraro were the Oromo (80.04%), the Alaba (4.05%), the Kambaata (3.01%), the Welayta (2.82%), and the Amhara (1.01%); all other ethnic groups made up 9.07% of the population.